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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill Activity | A summary of the activity and balances related to goodwill by reporting segment is as follows:
| December 31, 2018 |  | Acquisitions |  | Other (1) |  | September 30, 2019
Eastern region | $ | 28,154 |  |  | $ | 2,566 |  |  | $ | — |  |  | $ | 30,720 |
Western region | 120,536 |  |  | 21,614 |  |  | (2,619) |  |  | 139,531 |
Recycling | 12,315 |  |  | — |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | — |  |  | 1,729 |
Total | $ | 162,734 |  |  | $ | 24,180 |  |  | $ | (2,619) |  |  | $ | 184,295 |
(1)Relates to the unregistered sale of Class A common stock that was previously held in escrow and released to us for liquidation . See Note 10, Stockholders' Equity for additional disclosure.
Summary of Intangible Assets by Intangible Asset Type | A summary of intangible assets by intangible asset type follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, September 30, 2019 |  |  |  |  |
Intangible assets | $ | 26,162 |  |  | $ | 71,122 |  |  | $ | 97,284 |
Less accumulated amortization | (18,575) |  |  | (17,726) |  |  | (36,301) |
| $ | 7,587 |  |  | $ | 53,396 |  |  | $ | 60,983 |
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2018 |  |  |  |  |
Intangible assets | $ | 21,750 |  |  | $ | 44,363 |  |  | $ | 66,113 |
Less accumulated amortization | (17,584) |  |  | (13,762) |  |  | (31,346) |
| $ | 4,166 |  |  | $ | 30,601 |  |  | $ | 34,767 |
Summary of Intangible Amortization Expense Estimated | A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2018 and thereafter follows:
Estimated Future Amortization Expense as of September 30, 2019 |
Fiscal year ending December 31, 2019 | $ | 2,264 |
Fiscal year ending December 31, 2020 | $ | 8,222 |
Fiscal year ending December 31, 2021 | $ | 6,826 |
Fiscal year ending December 31, 2022 | $ | 6,188 |
Fiscal year ending December 31, 2023 | $ | 5,993 |
Thereafter | $ | 31,490 |

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